• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

What are drugs? A drug is a substance which alters the way the body works. Drugs which affect the brain fall into four main categories: Stimulants, Sedatives, Hallucinogens and Painkillers.

Extracts from this document...

Introduction

What are drugs? A drug is a substance which alters the way the body works. Drugs which affect the brain fall into four main categories: Stimulants, Sedatives, Hallucinogens and Painkillers. Stimulants These drugs speed up the brain and make you alert. They include Amphetamines which were used for relieving blocked noses. Cocaine is one of them, found in the leaves off certain South American plants. Coffee and tea also contain caffeine (also a stimulant). Nicotine is also a stimulant, found in tobacco. ...read more.

Middle

Drugs in this category include Cannabis, and LSD (lysergic acid diethylamide). These drugs can produce nightmares, and sometimes fatal accidents Pain Killers These stop you from feeling pain. They include mild drugs such as aspirin to strong drugs, like heroin and Morphine, which are taken from opium (poppy seeds). Morphine is given to people who have been injured, or have a strong illness. Why Are Drugs Dangerous? Drugs can be helpful if they are taken under doctors orders. However, if a wrong dose is taken, it can be very harmful. There may be three main reasons for this. ...read more.

Conclusion

An experienced driver also tried to get his 2.44m bus into a 2.03m gap. Damage the body Drugs are poisons and can kill cells. Alcohol kills cells in the Brain and liver - Prolonged drinking can cause Cirrhosis, where the liver cells are replaced by useless fibrous tissue. Aspirin can also damage the stomach lining. Dependent on Drugs The Body can also become dependent on drugs. Nicotine and Cannabis can become habit forming. You become psychologically dependent on the Drugs. Heroin and Alcohol are worse, if the person does not get it, the drug can produce withdrawal symptoms such as vomiting and dizziness. The person has become psychologically dependent, or addicted to the drug. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Humans as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Here's what a star student thought of this essay

3 star(s)

Response to the question

This essay offers a solid outline to drugs and their effect on the body, however there is plenty of room for improvement. I like how the essay is structured, offering a categorisation of drugs in the introduction and then an ...

Read full review

Response to the question

This essay offers a solid outline to drugs and their effect on the body, however there is plenty of room for improvement. I like how the essay is structured, offering a categorisation of drugs in the introduction and then an explanation of each. I would've like to have seen an exploration of the difference between legal and illegal drugs.

Level of analysis

The analysis is sound, but could be much more detailed. For example, when discussing that cocaine is a stimulant, I would've mentioned that it increases neurotransmission across the synapses. It is key to show understanding of the effects beyond "speed up the brain and make you alert". When mentioning stimulants, I like to note they increase motivation, heart rate, blood pressure, productivity and make you feel as if you need less sleep - this enables a good link to caffeine, allowing you to comment on why it is so popular in the morning! Such links to real-world applications will gain credit. When talking about drugs being dangerous, I would've hoped the discussion would be more sophisticated. Talking about alcohol and bus drivers isn't a strong example, whereas a teenager needing their stomach pumped is. An exploration of why dependency on drugs occurs, and why it is so difficult to stop addictions, would have been a useful area to gain marks. A common flaw when students talk about addiction is that they think heroine, nicotine and alcohol are the only examples. In my opinion, discussing an addiction to caffeine shows a full understanding of dependency.

Quality of writing

This essay is structured well and the clear sections makes it easy to follow. I would've liked to have seen a few more scientific terms - this feels like more of a PSHE essay than a biology investigation. Spelling, punctuation and grammar are fine throughout.


Did you find this review helpful? Join our team of reviewers and help other students learn

Reviewed by groat 13/02/2012

Read less
Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Humans as Organisms essays

  1. Marked by a teacher

    Biology Revision notes - Human Biology

    5 star(s)

    Female anopheles mosquito bites, injecting saliva and plasmodium 2. Reaches the liver and multiplies inside 3. Released into blood stream where they multiply and burst red blood cells 4. Travels in the blood stream, reaching every organ and slowly shutting them down 5. Another non-infected mosquito can now bite and collect the plasmodium, and pass it on to someone else.

  2. Marked by a teacher

    Should the MMR vaccination be made compulsory in the UK?

    5 star(s)

    The World Health Organisation regards the vaccines safety as "exemplary". [16] 3.4 Practicality Furthermore, the 3 in 1 vaccine is an efficient way of ensuring protection to 3 independent diseases. It is cheaper and easier to administer the vaccine as one injection rather than as three separate doses, which also saves doctors and nurses a lot of time.

  1. Marked by a teacher

    Science in the news- should cannabis be legal?

    4 star(s)

    I don't really think that any report can be trusted much more than a Government report. As well as physically, and socially, the plant 'Cannabis Sativa' which makes Cannabis can also be a benefit to the Environment. For thousands of years the plant has been used to make dozens of commercial products like paper, rope, canvas, and textiles.

  2. Marked by a teacher

    Investigate the effect of altitude training on the density of blood.

    4 star(s)

    This results in increased oxygen availability for the working muscle and a related improvement in aerobic energy supply and therefore performance. Training at altitude will also affect the amount and concentration of haemoglobin. Oxygen use in the Human body- Humans need oxygen in order to break down food for energy; energy is produced in the body by using oxygen.

  1. An experiment to investigate the rate of anaerobic respiration of yeast in various respiratory ...

    but I must take into account that this could affect the reliability of my results. Another possible way in which Oxygen may have affected the anaerobic conditions was through gaps in the capillary tubing. Even though rubber tubing was used to seal any air gaps at connecting points, I feel

  2. Human biology short notes

    Acts as an enzyme and converts prothrombin to thrombin * Thrombin acts on soluble fibrinogen * And converts it to insoluble fibrin with the help of vitamin K and calcium ions * Fibrin for a thread like network of fibres * The mesh of fibres traps the red blood cells

  1. The effect of exercise on gas exchange and breathing

    Dopamine is a neurotransmitter and stimulates the increase in the frequency of impulses sent to respiratory centres and therefore increases ventilation. This reflex doesn't appear to play a vital role in day-to-day ventilation as the arterial PO2 has to be significantly reduced.

  2. Diabetes Type 1 and 2

    These symptoms tend to develop quite quickly, after treatment is started, the symptoms soon settle and go. However, without treatment, the blood glucose level becomes very high and acids form in the bloodstream called ketosis.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work